[ublas] Adding a constructor to bounded_vector

From: Rob McDonald (ramcdona_at_[hidden])
Date: 2008-08-20 16:26:51

I would like to be able to have a bounded_vector<double, 3> which I can 
instantiate something like this...

typedef bounded_vector<double, 3> vect;
vect v = vect(0.0, 1.23, 3.45);

This requires a new constructor of the form

bounded_vector(T x, T y, T z);

Since constructors and the equals operator aren't inherited, I can't 
just implement this one constructor.  And, while I'm at it, I may as 
well keep the code generic to type, but specific to 3 elements...

So, I've copied the code for a bounded_vector from vector.hpp.  So far, 
all I've really done is change the template parameter N to a 3.  At this 
point, I can't figure out how to implement my desired constructor...

I need to either 1) access the data directly or 2) use the available 
interface.

I poked around in the source such that 'data () [i] =' looked like it 
might be promising, but that doesn't seem to work.  No combinations of 
'this(i) =' or what not have worked either.

For 1), I haven't been able to figure out for sure where the data is 
really stored and if I have access permissions to it.

For 2), I haven't been able to figure out how to access the overloaded 
() operator in the constructor.

Here is one of many failed attempts:

   BOOST_UBLAS_INLINE
   bounded_vector3 (T x, T y, T z):vector_type(3){
     data () [0] = x;
     data () [1] = y;
     data () [2] = z;
   }

After I get that working, I have another similar challenge...

I would like to be able to assign one of these vectors with a comma 
delimited list.  This is currently done in Blitz++, and I am migrating 
some code from Blitz to boost::ublas.

So, I want to be able to do this....

vect v;
v = (1.2), (3.5), (7.8);  // I'm not sure if the () are significant.

Any help will be greatly appreciated,

Rob